Willy is the bassist for the Scottish hair metal band Love Fist. Just like fellow Love Fist band members Dick and Percy, his name is a sex joke from Rockstar as it is a slang term for a penis. According to Jezz Torrent, Willy wears women's underwear. Willy is the only member of Love Fist who is never seen in person anywhere in the game.

He reappears in the Strangers & Freaks mission strand "Vinewood Souveniers", when Trevor steals his gold tooth during a brawl at Tequi-La-La.